Photographing apparatus

ABSTRACT

A photographing apparatus comprises an imaging sensor, a power supply control unit, and a moving-picture generating unit. The imaging sensor continuously performs imaging operations in a predetermined interval. The power supply control unit controls a power-supply operation to the imaging sensor during a waiting period that is defined as a period from the end of one imaging operation of the imaging operations to the beginning of the next imaging operation of the imaging operations. The moving-picture generating unit generates a moving-picture file based on still pictures obtained by the imaging operations.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a photographing apparatus, and inparticular to the photographing apparatus that continuously performs theimaging operations in a predetermined interval.

2. Description of the Related Art

A photographing apparatus that can perform an intermittent photographingoperation that continuously performs imaging operations in apredetermined interval is proposed.

Japanese unexamined patent publication (KOKAI) No. 2004-15356 disclosesa photographing apparatus that can perform the intermittentphotographing operation.

However, it is necessary to access a plurality of files corresponding tothe plurality of still pictures that are obtained by the intermittentphotographing operation, in order to confirm the image obtained by theintermittent photographing operation.

SUMMARY OF THE INVENTION

Therefore, an object of the present invention is to provide aphotographing apparatus where the image obtained by the intermittentphotographing operation can be easily confirmed.

According to the present invention, a photographing apparatus comprisesan imaging sensor, a power supply control unit, and a moving-picturegenerating unit. The imaging sensor continuously performs imagingoperations in a predetermined interval. The power supply control unitcontrols a power-supply operation to the imaging sensor during a waitingperiod that is defined as a period from the end of one imaging operationof the imaging operations to the beginning of the next imaging operationof the imaging operations. The moving-picture generating unit generatesa moving-picture file based on still pictures obtained by the imagingoperations.

BRIEF DESCRIPTION OF THE DRAWINGS

The objects and advantages of the present invention will be betterunderstood from the following description, with reference to theaccompanying drawings in which:

FIG. 1 is a construction diagram of the photographing apparatus in theembodiment;

FIG. 2 is a figure that shows a relationship between the frames and thestill pictures when the still pictures are incorporated into the frameswithout duplication of the still pictures;

FIG. 3 is a figure that shows the relationship between the frames andthe still pictures when the still pictures including the duplicatedstill pictures are incorporated into the frames;

FIG. 4 is a flowchart that shows the process of the intermittentphotographing operation; and

FIG. 5 is a construction diagram of the photographing apparatusincluding the strobe-light-emitting unit.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention is described below with reference to theembodiment shown in the drawings. In the embodiment, the photographingapparatus 1 is a digital camera. The photographing apparatus 1 has animaging block 10, a controller 30, a memory 40, a display 50, and anoperation unit 60 (see FIG. 1).

The imaging block 10 has a photographing optical system, an imagingsensor such as a CCD, or a CMOS, etc., and a signal-processing circuit.

The photographic subject image is captured as an optical image through(via) the photographing optical system on an imaging surface of theimaging sensor. The imaging sensor converts the optical image to anelectric signal by photoelectric conversion. After the electric chargeis accumulated for a predetermined time (the exposure time) on theimaging sensor in the imaging operation, the electric signal based onthe accumulated electric charge is output from the imaging sensor to thesignal-processing circuit. The signal-processing circuit outputs theelectric signal corresponding to the photographing subject that isobtained by the imaging operation, to the controller 30 as an imagesignal.

The imaging sensor continuously performs the imaging operations in aphotographing interval TI, while an intermittent photographingoperation, described later, is performed.

The controller 30, which may be a CPU (Central Processing Unit) or a DSP(Digital Signal Processor), etc. controls each part of the photographingapparatus 1.

In the embodiment, the controller 30 has a power-supply function thatcontrols the power-supply operation to the imaging sensor, etc., duringthe waiting period of an intermittent photographing operation to bedescribed later, and has a moving-picture generating function thatgenerates a moving-picture file based on still pictures obtained by theintermittent photographing operation.

The controller 30 outputs an image data that can be stored in the memory40, on the basis of the image signal that is output from the imagingblock 10. Furthermore, in the embodiment, the controller 30 controls theimaging block 10 in order to perform the intermittent photographingoperation which performs the plurality of imaging operations in apredetermined time interval (the photographing interval TI). Thecontroller 30 generates the moving-picture file with a frame rate FR onthe basis of the still pictures corresponding to the image signalsobtained by the imaging operations in the photographing interval TI, andstores the moving-picture file to the memory 40.

The memory 40 stores the image data (the moving-picture file)corresponding to the moving picture obtained by the plurality of imagingoperations in a predetermined file format, such as Motion JPEG etc.

The display 50 displays the moving picture corresponding to themoving-picture file obtained by the plurality of imaging operations andinformation regarding the operation.

Furthermore, the memory 40 may store an image data (e.g., astill-picture file) corresponding to a still picture, among the stillpictures composing the moving-picture file.

The operation unit 60 is used for an ON/OFF control of a release switch(not depicted); a setting of parameters that are used for theintermittent photographing operation, such as the photographing intervalTI, a photographing time length TL from when the first imaging operationof the intermittent photographing operation commences to when the lastimaging operation of the intermittent photographing operation commences,a start time TS when the first imaging operation commences, and theframe rate FR, etc.; and a switching operation between an intermittentphotographing mode for performing the intermittent photographingoperation and another photographing mode for performing otherphotographing operations.

The waiting period is defined as the period in the intermittentphotographing mode from the end of the imaging operation to thebeginning of the next imaging operation.

During the waiting period, the power-supply operation to all parts ofthe photographing apparatus 1, except for a control part including aclock that controls the photographing interval TI, such as the one inthe controller 30 etc., are stopped; in other words, the photographingapparatus 1 is set to a sleep mode.

Aside from the control part of the photographing apparatus 1, there areexothermic parts that generate heat from continuous use, such as theimaging sensor, etc., of the imaging block 10, and high electric demandparts, such as the LCD of the display 50, etc.

By cutting the power supply to the exothermic parts, the heat build-upof the photographing apparatus 1 can be reduced.

By cutting the power supply to the high power-demanding parts, theelectric consumption of the photographing apparatus 1 can be reduced aswell.

In order to perform the intermittent photographing operation in theintermittent photographing mode, the imaging operations that capture thestill picture are continuously performed, in the photographing intervalTI, after the start time TS, for the photographing time length TL.

The still pictures corresponding to the image signals captured by theimaging operations are arranged in a time series, and are incorporatedinto the frames composing the moving picture. Then, the moving-picturefile is generated.

In order to adjust the playback speed of the moving picture, it isdesirable to duplicate all the still pictures before arranging them inthe time series. At duplication, the same number of duplicates are madefor each still picture.

For example, when the parameters are set to the frame rate FR of 15 fps,the photographing interval TI of 1 minute, and the photographing timelength TL of 14 minutes, a moving-picture file is generated with aplayback length of 1 second with 15 still pictures obtained by the 15imaging operations (see FIG. 2). In other words, a group of still imagesthat are obtained by the imaging operations over 14 minutes, isconverted to the moving-picture file whose playback length is 1 second.

The moving picture corresponding to such a moving-picture file is hardto appreciate because of its brevity. In other words, when the framerate FR is high (fast) or the photographing time length TL is long, theplayback speed of the moving picture becomes fast (e.g., the playbacklength of the moving picture becomes short), so that it becomes hard toappreciate.

On the other hand, four copies of each still picture are made so thatthe same five still pictures are sequentially arranged followed by thenext set of five duplicate still pictures, and so on, such that themoving-picture file is generated on the basis of the sequentiallyarranged still pictures. Thus, when the actual frame rate FR of themoving-picture file is 3 fps, the playback length is 5 seconds, that is,5 times of the length of the moving picture without duplication. Inother words, the playback speed of the moving picture is slowed comparedto the playback speed without duplication (see FIG. 3).

In FIGS. 2 and 3, the numbers in parentheses show the order of the stillimages obtained by the imaging operations.

In the case that it is unnecessary to adjust the playback speed of themoving picture, the duplication described in step S13 of FIG. 4 may beomitted. Specifically, in the case that the frame rate FR issufficiently low (slow) or the photographing interval TI is sufficientlyshort, etc., the playback speed of the moving picture is sufficientlyslow so as to be perceivable as a moving picture, and it is unnecessaryto adjust the playback speed of the moving picture.

The operation for generating the moving-picture file is performedwhenever the imaging operation for the intermittent photographingoperation is performed. Namely, after the imaging operation for theintermittent photographing operation is performed, the still picturethat is obtained by this imaging operation and the duplicated stillpicture(s) are appended to the moving-picture file.

Therefore, even if the intermittent photographing operation isinterrupted, the moving-picture file is generated on the basis of thestill picture(s) obtained by the imaging operation(s) prior to theinterruption.

Next, the flow of the intermittent photographing operation in theembodiment will be explained with reference to the flowchart in FIG. 4.

When the photographing apparatus 1 is set to the intermittentphotographing mode and the release button or the start button for theintermittent photographing operation is operated by the user's operationof the operation unit 60, the intermittent photographing operationcommences.

In step S11, it is determined whether the current time is the time tobegin the imaging operation in the intermittent photographing operation.In other words, it is determined whether the current time is equal tothe start time TS or to a time that is an integral multiple of thephotographing interval TI, given by Ti×n, where n is a counting number,which has elapsed from the start time TS.

When it is determined that the current time is the time to begin theimaging operation in the intermittent photographing operation, theoperation continues to step S12, otherwise, the operation proceedsdirectly to step S19.

In step S12, the imaging operation for obtaining one still picture isperformed. In step S13, a copy or copies of the still picture that isobtained in step S12 is/are made.

In step S14, it is determined whether the moving-picture file includingthe still picture obtained in step S12 has already been stored in thememory 40.

When the first imaging operation is performed immediately after thestart time TS, the moving-picture file including the still pictureobtained in step S12 has not yet been stored in the memory 40. This isbecause the first still picture corresponding to the first imagingoperation is stored in the memory 40 as a moving-picture file after thefirst imaging operation. Therefore, the operation proceeds directly tostep S17.

When the n^(th) imaging operation is performed, at a time period whichis an integral multiple of the photographing interval TI, (that is,given by Ti×n) has elapsed after the start time TS, the moving-picturefile including the first to n^(th) still pictures have already beenstored in the memory 40. After the n^(th) imaging operation, the(n+1)^(th) still picture is appended to the moving-picture fileincluding the first to n^(th) still pictures held in the memory 40.Thereupon the operation continues to step S15.

In step S15, the moving-picture file that is generated on the basis ofthe first to n^(th) still pictures including the duplicated first ton^(th) still pictures is read from the memory 40. In step S16, the(n+1)^(th) still picture including the duplicated (n+1)^(th) stillpicture(s) is/are appended to the moving-picture file that is read fromthe memory 40 in step S15. Then the moving-picture file to which the(n+1)^(th) still picture is appended is stored (overwritten) in thememory 40.

In step S17, the moving-picture file based on the first still pictureincluding the duplicated first still picture(s) is generated and storedin the memory 40.

In step S18, it is determined whether the elapsed time from the starttime TS is equal to the photographing time length TL. When it isdetermined that the elapsed time from the start time TS is equal to thephotographing time length TL, the intermittent photographing operationis terminated, otherwise, the operation continues to step S19.

In step S19, the photographing apparatus 1 is set to the sleep modeduring the waiting period that is defined as the period from the end ofthe imaging operation to the beginning of the next imaging operation.

In step S20, it is determined whether termination of the intermittentphotographing operation is ordered by the user's operation of theoperation unit 60.

When it is determined that the termination of the intermittentphotographing operation is operated, the intermittent photographingoperation is terminated, otherwise, the operation returns to step S11for the next imaging operation of the intermittent photographingoperation.

In the embodiment, during the waiting period defined as the period inthe intermittent photographing mode from the end of the imagingoperation to the beginning of the next imaging operation, the powersupply to each part of the photographing apparatus 1 except for thecontroller 30, is cut. In other words, the photographing apparatus 1 isset to the sleep mode.

By cutting the power supply to the most exothermic parts, waste heatfrom the photographing apparatus 1 including the imaging sensor, can beeffectively reduced.

By cutting the power supply to the most power-demanding parts, theelectric consumption of the photographing apparatus 1 including thedisplay 50 can be effectively reduced. Therefore, a prolongedintermittent photographing operation can be performed even if thephotographing apparatus 1 is driven by a battery.

Furthermore, in the case that the photographing apparatus 1 is a dust-and water-proofed camera, since the intermittent photographing operationcan be performed under conditions where the photographing apparatus 1 isset outdoors for a long time, time exposures of slow events such asflower blossoming can be captured.

Moreover, because the electric consumption can be reduced, a strobelight can be used in each imaging operation of the intermittentphotographing operation so that the photographing subjects can becaptured under dark conditions.

In this case, either the photographing apparatus 1 or another apparatusis provided with a strobe-light-emitting unit 70 (see FIG. 5) thatflashes in synchrony with the imaging operations in the intermittentphotographing operation.

Furthermore, the still pictures obtained by the imaging operations forthe intermittent photographing operation are incorporated into theframes composing the moving picture so that the moving-picture file isgenerated. Therefore, the user can easily confirm the image (the movingpicture represented in the moving-picture file) by playing back themoving-picture file on the display 50 or a personal computer (notdepicted).

Furthermore, the still picture obtained by the latest imaging operationis appended to the moving-picture file whenever the imaging operationfor the intermittent photographing operation is performed (see steps S15and S16 in FIG. 4).

Therefore, even if the intermittent photographing operation isinterrupted, the moving-picture file will be generated on the basis ofthe still picture(s) obtained by the imaging operation(s) prior to theinterruption.

Furthermore, when the frame rate FR is high (fast) or the photographinginterval TI is long, so that the playback speed of the moving picturebecomes fast (i.e., the playback length of the moving picture becomesshort), the actual frame rate is adjusted such that the predeterminedpieces of the still pictures are duplicated and the original stillpicture and the duplicated still picture(s) are continuouslyincorporated into the frames composing the moving picture. Thus, theuser can comfortably appreciate a moving picture whose actual frame ratehas been adjusted.

Although the embodiment of the present invention has been describedherein with reference to the accompanying drawings, obviously manymodifications and changes may be made by those skilled in this artwithout departing from the scope of the invention.

The present disclosure relates to subject matter contained in JapanesePatent Application No. 2007-023188 (filed on Feb. 1, 2007) which isexpressly incorporated herein by reference, in its entirety.

1. A photographing apparatus comprising: an imaging sensor thatcontinuously performs imaging operations in a predetermined interval; apower supply control unit that controls a power-supply operation to saidimaging sensor during a waiting period that is defined as a period fromthe end of one imaging operation of said imaging operations to thebeginning of the next imaging operation of said imaging operations; anda moving-picture generating unit that generates a moving-picture filebased on still pictures obtained by said imaging operations.
 2. Thephotographing apparatus according to claim 1, further comprising anoperation unit that is used for setting said predetermined interval, aphotographing time length from when a first imaging operation of saidimaging operations commences, to when a last imaging operation of saidimaging operations commences, and a start time when said first imagingoperation commences.
 3. The photographing apparatus according to claim1, wherein all said still pictures are duplicated; and saidmoving-picture file is generated based on said still pictures includingsaid duplicated still pictures.
 4. The photographing apparatus accordingto claim 1, wherein said moving-picture generating unit generates saidmoving-picture file whenever an imaging operation of said imagingoperations is performed.
 5. The photographing apparatus according toclaim 4, wherein said photographing apparatus is set to a sleep modeafter said moving-picture file is generated.
 6. The photographingapparatus according to claim 1, further comprising astrobe-light-emitting unit that flashes a strobe light in synchrony withsaid imaging operations.
 7. The photographing apparatus according toclaim 1, wherein said moving-picture file is generated by incorporatingsaid still pictures into frames composing a moving picture representedby said moving-picture file.